On Mantle, wallet transactions use MNT for network fees, even when you are moving ETH. Keep enough MNT in your wallet to pay for the actions you plan to take after your transfer.
Moving assets between Ethereum and Mantle is different from sending them between exchange accounts. For the full transfer sequence, read how to deposit and withdraw with Mantle Bridge. This guide covers the next question: how to pay for wallet transactions once your assets are on Mantle.
mantlebridge.org is the official service for moving ETH, MNT, and supported tokens between Ethereum and Mantle. Mantle Bridge transfers assets between those networks; your wallet needs MNT on Mantle to make later transactions there.
What pays a fee on Mantle?
MNT pays the network fee for each transaction you send from your wallet on Mantle. A network fee is the payment that helps process your transaction and record it on the blockchain.
The fee depends on the transaction and network conditions. Sending ETH, approving a token, and using an app can each require a separate transaction. Your wallet shows the fee estimate before you confirm.
Why keep MNT if you already have ETH?
ETH and MNT have different jobs in this example: ETH is the asset you want to use, while MNT pays the Mantle network fee. A balance of ETH alone does not cover that fee.
Think of the networks as separate accounts. ETH shown on Ethereum is not the same balance as ETH shown on Mantle, and MNT on Ethereum cannot pay a fee on Mantle until it is there too. Check your wallet’s selected network before judging whether you have funds to act.
How do you plan enough MNT?
Estimate the MNT you need from the fees your wallet quotes for the actions you expect to make. Use this short sequence before spending your bridged assets.
- Choose your first action. Decide whether you will send ETH, approve a token, or use an app on Mantle. Each separate action may need its own transaction and fee.
- Check the fee in your wallet. Select Mantle and prepare that action. Read the quoted fee in MNT before confirming; cancel if you only meant to check the estimate.
- Add up planned fees. If you expect to approve a token and then send it, count both transactions. Leave some extra MNT because the final fee can change with network conditions.
- Check your MNT balance on Mantle. Compare it with your estimate before using your ETH or other tokens. If it is short, arrange MNT on Mantle before starting actions that need gas.
For example, say your wallet quotes a fee for approving a token and another fee for sending it. Budget for both, plus a buffer. Do not assume the approval fee also pays for the later send.
What if a transaction cannot proceed?
If your wallet says you lack funds for gas, check that it is set to Mantle and that your MNT balance is on that network. Having MNT in an exchange account or on Ethereum does not give your Mantle wallet spendable gas there.
Before confirming, check the network, recipient address, token, and fee in the wallet summary. A bridge transfer and a later wallet transaction are separate actions, each with its own confirmation and fee. Never share your recovery phrase to get help.
Practical tip: keep a small MNT reserve untouched until your planned Mantle transactions are complete.
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